Mechanical stoker.



N0. 7s5,ss5. PATENTED MAR. 28, 1905. -L.ROTH.

MECHANICAL STOKER.

APPLIOATION FILED JULY 30, 1904.

2 SHEETS-SHEET 1.

PATENTED MAR. 28, 1905:

L. ROTH. MECHANICAL STOKER.

APPLICATION FILED JULY 30, 1904.

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Patented March 28, 1905.

UNITED STATES PATENT OFFICE.

LUDl/VIG ROTH, OF ST. LOUIS, MISSOURI.

MECHANICAL STOKER.

SPECIFICATION forming part of Letters Patent No. 785,835, dated March28, 1905.

' Application filed July 30, 1904. Serial No. 218,803.

T0 at whmn it nuty concern:

Be it known that LLUDWIG ROTH, a citizen of the United States, residingat St. Louis, State of Missouri, have invented certain new and usefulImprovements in Mechanical Stoker's, of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawings, forming a part hereof.

My invention has relation to improvements in mechanical stokers; and itconsists in the novel construction and arrangement of parts more fullyset forth in the specification, and pointed out in the claims.

In the drawings, Figure 1 is a side elevation of an engine and itstender with parts broken away, showing my invention applied thereto.Fig. 2 is a vertical longitudinal section on line 2 2 of Fig. 5, theconveyer being in elevation. Fig. 3 is a side elevation of the apparatuswith parts broken away. Fig. 4 is a vercal transverse section on line 44 of Fig. 2. Fig. 5 is a front elevation thereof, and Fig. 6 is ahorizontal section on line 6 6 of Fig. 2 with parts broken away.

he object of my invention is to construct a stoker which can be set inmotion at any time by the driving-power of the steam of the boiler, thestoker being so constructed as to forcibly inject the fuel into thefire-box of such boiler, as will hereinafter more fully appear from adetailed description of the invention, which is as follows:

Referring to the drawings, 1 represents a suitable hopper in which thecoal is initially stored, said hopper having, preferably, inclinedwalls, as shown, and surmounting an elongated casing 2, within which isconfined an endless-belt conveyer 3, said conveyer being carried by thesprocket-chains 4, passing over sprocket-wheels 5 5. At intervals theupper flap of the conveyer is supported on rollers 6. The shaft 7 of theforward sprockets 5 carries a gear-wheel 8, which meshes with a pinion 9on a shaft 10, the latter having disposed thereon a series of radialblades 11, incased in a shield or hood 12, hinged to the casing 2. Theshaft 7 likewise forms the shaft of the steam rotary engine 13, whichcan be set in motion by the engineer at any time 'by opening the valve14 in the steam-supply pipe 15, the spent steam escaping through theexhaust-pipe 16.

To operate the stoker, the rotary engine is set in motion, as shown bythe arrow in Fig. 3, the pinion 9 being rotated in the direction shownby the arrow in said figure, the blades 11 revolving, as shown in Fig.2. The parts being thus set into motion, the conveyer travels in thedirection indicated by the arrows in Fig. 1, the coal being graduallyfed forward on the conveyer until it reaches the end thereof, when itencounters the rapidly revolving blades 11, which engage the coal,sweeping it across the inclined platform or plate 17, Fig. 2, andforcibly injecting it into the fire-box of the boiler, as seen inFig. 1. The rapid rotation imparted to the blades 11 is very esseu'tial, for then the deposit of the coals into the innermost portions ofthe fire-box is assured. The platform 17 of course insures properdirection for the final injection of the fuel into the fire-box.

It is of course apparent that I may depart from the details ofconstruction here shown without affecting the nature or spirit of myinvention.

Having described my invention, what I claim is l. A mechanical stokercom prising a casing, means for feeding coal thereto, a travelingconveyer in the casing for advancing the coal fed into the casing towardthe fire-boX of the boiler, a revolving blade arranged to remove thecoal from the conveyer, located at a point between the fire-box and thedischarge end of the conveyer, and having a peripheral velocity inexcess of the belt conveyer whereby the coal is forcibly injected intothe furnace, substantially as set forth.

2. A mechanical stoker comprising a hopper, a casing at the basethereof, a traveling belt conveyer for advancing the coal toward thefire-box of the boiler, a revolving series of blades located at theforward end of the conveyer and between the latter and the fire-box andarranged to remove the coal from the conveyer, said blades having aperipheral velocity in excess of the belt conveyer whereby the coal isforcibly injected into the furnace, substantially as set forth.

3. A mechanical stoker comprising a hopper, a casing at the basethereof, a traveling belt conveyor in said casing. a motor for impartingmotion to the conveyer, a series of revolving blades disposed about ashaft at one end of the conveyer for removing the coal therefrom andinjecting it into the fire-box, and suitable speed-multiplying gearinterposed between said motor and the shaft of the blades for rotatingthe latter at an increased speed over the conveyer, substantially as setforth.

4:. A mechanical stoker comprising a hopper, a casing at the basethereof, a traveling belt conveyer in said casing, a motor for impartingmotion to the conveyer, a gear-wheel

